examples/org.eclipse.epsilon.examples.sirius.eol/org.eclipse.epsilon.sirius.widget.examples.statemachine.design/src/org/eclipse/epsilon/sirius/widget/examples/statemachine/design/Activator.java

/*********************************************************************
* Copyright (c) 2021 The University of York.
*
* This program and the accompanying materials are made
* available under the terms of the Eclipse Public License 2.0
* which is available at https://www.eclipse.org/legal/epl-2.0/
*
* SPDX-License-Identifier: EPL-2.0
**********************************************************************/
package org.eclipse.epsilon.sirius.widget.examples.statemachine.design;

import java.util.HashSet;
import java.util.Set;

import org.eclipse.sirius.business.api.componentization.ViewpointRegistry;
import org.eclipse.sirius.viewpoint.description.Viewpoint;
import org.eclipse.ui.plugin.AbstractUIPlugin;
import org.osgi.framework.BundleContext;

/**
 * The activator class controls the plug-in life cycle
 */
public class Activator extends AbstractUIPlugin {
    // The plug-in ID
    public static final String PLUGIN_ID = "org.eclipse.epsilon.sirius.widget.examples.statemachine.design";

    // The shared instance
    private static Activator plugin;

    private static Set<Viewpoint> viewpoints; 

    /**
     * The constructor
     */
    public Activator() {
    }

    /*
     * (non-Javadoc)
     * 
     * @see org.eclipse.ui.plugin.AbstractUIPlugin#start(org.osgi.framework.BundleContext)
     */
    public void start(BundleContext context) throws Exception {
      super.start(context);
	  plugin = this;
	  viewpoints = new HashSet<Viewpoint>();
	  viewpoints.addAll(ViewpointRegistry.getInstance().registerFromPlugin(PLUGIN_ID + "/description/statemachine.odesign")); 
    }

    /*
     * (non-Javadoc)
     * 
     * @see org.eclipse.ui.plugin.AbstractUIPlugin#stop(org.osgi.framework.BundleContext)
     */
    public void stop(BundleContext context) throws Exception {
	plugin = null;
	if (viewpoints != null) {
	    for (final Viewpoint viewpoint: viewpoints) {
		ViewpointRegistry.getInstance().disposeFromPlugin(viewpoint);
	    }
	    viewpoints.clear();
	    viewpoints = null; 
	}
	super.stop(context);
    }

    /**
     * Returns the shared instance
     * 
     * @return the shared instance
     */
    public static Activator getDefault() {
	return plugin;
    }
}